Lungs 3D Model

I made this lung model as a gift for a friend doctor.There are slight anatomical differences among the same human organs: I have chosen to print this particular scan because the front parts of the lungs slightly overlap, giving the structure more strenght. Otherwise, the only trachea should keep jointed the two lungs, and the structure would be more fragile.Please notice that the .stl file is as big as 48Mb. this because it is a high resolution. It's a long print: it took me about eight-nine hou